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<div id="overview"><a href="../../../../../../../../../../../../apidocs/org/sakaiproject/entitybus/util/http/LazyResponseOutputStream.html">View Javadoc</a></div><pre>

<a name="1" href="#1">1</a>   <em>/**<em>*</em></em>
<a name="2" href="#2">2</a>   <em> * $Id: LazyResponseOutputStream.html 12 2009-01-29 12:00:24Z azeckoski $</em>
<a name="3" href="#3">3</a>   <em> * $URL: http://entitybus.googlecode.com/svn/maven/site/entitybus-utils/xref/org/sakaiproject/entitybus/util/http/LazyResponseOutputStream.html $</em>
<a name="4" href="#4">4</a>   <em> * LazyOutputStream.java - entity-broker - Aug 15, 2008 7:52:58 PM - azeckoski</em>
<a name="5" href="#5">5</a>   <em> **************************************************************************</em>
<a name="6" href="#6">6</a>   <em> * Copyright (c) 2008 Sakai Foundation</em>
<a name="7" href="#7">7</a>   <em> *</em>
<a name="8" href="#8">8</a>   <em> * Licensed under the Educational Community License, Version 2.0 (the "License");</em>
<a name="9" href="#9">9</a>   <em> * you may not use this file except in compliance with the License.</em>
<a name="10" href="#10">10</a>  <em> * You may obtain a copy of the License at</em>
<a name="11" href="#11">11</a>  <em> *</em>
<a name="12" href="#12">12</a>  <em> *       <a href="http://www.osedu.org/licenses/ECL-2.0" target="alexandria_uri">http://www.osedu.org/licenses/ECL-2.0</a></em>
<a name="13" href="#13">13</a>  <em> *</em>
<a name="14" href="#14">14</a>  <em> * Unless required by applicable law or agreed to in writing, software</em>
<a name="15" href="#15">15</a>  <em> * distributed under the License is distributed on an "AS IS" BASIS,</em>
<a name="16" href="#16">16</a>  <em> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</em>
<a name="17" href="#17">17</a>  <em> * See the License for the specific language governing permissions and</em>
<a name="18" href="#18">18</a>  <em> * limitations under the License.</em>
<a name="19" href="#19">19</a>  <em> */</em>
<a name="20" href="#20">20</a>  
<a name="21" href="#21">21</a>  <strong>package</strong> org.sakaiproject.entitybus.util.http;
<a name="22" href="#22">22</a>  
<a name="23" href="#23">23</a>  <strong>import</strong> java.io.IOException;
<a name="24" href="#24">24</a>  <strong>import</strong> java.io.OutputStream;
<a name="25" href="#25">25</a>  
<a name="26" href="#26">26</a>  <strong>import</strong> javax.servlet.http.HttpServletResponse;
<a name="27" href="#27">27</a>  
<a name="28" href="#28">28</a>  <em>/**<em>*</em></em>
<a name="29" href="#29">29</a>  <em> * This will get the response to get an outputstream from but will not actually get it from the response</em>
<a name="30" href="#30">30</a>  <em> * until someone attempts to use the outputstream&lt;br/></em>
<a name="31" href="#31">31</a>  <em> * This is horrible but required because of the way Sakai tool forwarding works&lt;br/></em>
<a name="32" href="#32">32</a>  <em> * </em>
<a name="33" href="#33">33</a>  <em> * @author Aaron Zeckoski (azeckoski @ gmail.com)</em>
<a name="34" href="#34">34</a>  <em> */</em>
<a name="35" href="#35">35</a>  <strong>public</strong> <strong>class</strong> <a href="../../../../../org/sakaiproject/entitybus/util/http/LazyResponseOutputStream.html">LazyResponseOutputStream</a> <strong>extends</strong> OutputStream {
<a name="36" href="#36">36</a>  
<a name="37" href="#37">37</a>      <em>/**<em>*</em></em>
<a name="38" href="#38">38</a>  <em>     * the output stream that will be used once it is first called</em>
<a name="39" href="#39">39</a>  <em>     */</em>
<a name="40" href="#40">40</a>      <strong>private</strong> OutputStream stream = <strong>null</strong>;
<a name="41" href="#41">41</a>      <strong>private</strong> HttpServletResponse response = <strong>null</strong>;
<a name="42" href="#42">42</a>      <strong>private</strong> OutputStream getStream() {
<a name="43" href="#43">43</a>          <strong>if</strong> (stream == <strong>null</strong>) {
<a name="44" href="#44">44</a>              <strong>try</strong> {
<a name="45" href="#45">45</a>                  stream = response.getOutputStream();
<a name="46" href="#46">46</a>              } <strong>catch</strong> (IOException e) {
<a name="47" href="#47">47</a>                  <strong>throw</strong> <strong>new</strong> RuntimeException(<span class="string">"LazyResponseOutputStream failed getting response output stream from HttpServletResponse"</span>, e);
<a name="48" href="#48">48</a>              }
<a name="49" href="#49">49</a>          }
<a name="50" href="#50">50</a>          <strong>return</strong> stream;
<a name="51" href="#51">51</a>      }
<a name="52" href="#52">52</a>  
<a name="53" href="#53">53</a>      <em>/**<em>*</em></em>
<a name="54" href="#54">54</a>  <em>     * @param response the response that will be used to get the outputstream,</em>
<a name="55" href="#55">55</a>  <em>     * this will die if someone has tried to get the writer out of this</em>
<a name="56" href="#56">56</a>  <em>     */</em>
<a name="57" href="#57">57</a>      <strong>public</strong> <a href="../../../../../org/sakaiproject/entitybus/util/http/LazyResponseOutputStream.html">LazyResponseOutputStream</a>(HttpServletResponse response) {
<a name="58" href="#58">58</a>          <strong>if</strong> (response == <strong>null</strong>) {
<a name="59" href="#59">59</a>              <strong>throw</strong> <strong>new</strong> IllegalArgumentException(<span class="string">"response cannot be null"</span>);
<a name="60" href="#60">60</a>          }
<a name="61" href="#61">61</a>          <strong>this</strong>.response = response;
<a name="62" href="#62">62</a>      }
<a name="63" href="#63">63</a>      @Override
<a name="64" href="#64">64</a>      <strong>public</strong> <strong>void</strong> write(byte[] b) throws IOException {
<a name="65" href="#65">65</a>          getStream().write(b);
<a name="66" href="#66">66</a>      }
<a name="67" href="#67">67</a>      @Override
<a name="68" href="#68">68</a>      <strong>public</strong> <strong>void</strong> write(byte[] b, <strong>int</strong> off, <strong>int</strong> len) throws IOException {
<a name="69" href="#69">69</a>          getStream().write(b, off, len);
<a name="70" href="#70">70</a>      }
<a name="71" href="#71">71</a>      @Override
<a name="72" href="#72">72</a>      <strong>public</strong> <strong>void</strong> write(<strong>int</strong> b) throws IOException {
<a name="73" href="#73">73</a>          getStream().write(b);
<a name="74" href="#74">74</a>      }
<a name="75" href="#75">75</a>      @Override
<a name="76" href="#76">76</a>      <strong>public</strong> <strong>void</strong> close() throws IOException {
<a name="77" href="#77">77</a>          getStream().close();
<a name="78" href="#78">78</a>      }
<a name="79" href="#79">79</a>      @Override
<a name="80" href="#80">80</a>      <strong>public</strong> <strong>void</strong> flush() throws IOException {
<a name="81" href="#81">81</a>          getStream().flush();
<a name="82" href="#82">82</a>      }
<a name="83" href="#83">83</a>      @Override
<a name="84" href="#84">84</a>      <strong>public</strong> <strong>boolean</strong> equals(Object obj) {
<a name="85" href="#85">85</a>          <strong>if</strong> (stream == <strong>null</strong>) {
<a name="86" href="#86">86</a>              <strong>return</strong> <strong>super</strong>.equals(obj);
<a name="87" href="#87">87</a>          } <strong>else</strong> {
<a name="88" href="#88">88</a>              <strong>return</strong> getStream().equals(obj);
<a name="89" href="#89">89</a>          }
<a name="90" href="#90">90</a>      }
<a name="91" href="#91">91</a>      @Override
<a name="92" href="#92">92</a>      <strong>public</strong> <strong>int</strong> hashCode() {
<a name="93" href="#93">93</a>          <strong>if</strong> (stream == <strong>null</strong>) {
<a name="94" href="#94">94</a>              <strong>return</strong> <strong>super</strong>.hashCode();
<a name="95" href="#95">95</a>          } <strong>else</strong> {
<a name="96" href="#96">96</a>              <strong>return</strong> getStream().hashCode();
<a name="97" href="#97">97</a>          }
<a name="98" href="#98">98</a>      }
<a name="99" href="#99">99</a>      @Override
<a name="100" href="#100">100</a>     <strong>public</strong> String toString() {
<a name="101" href="#101">101</a>         <em class="comment">// make sure the toString does not actually open up the lazy stream</em>
<a name="102" href="#102">102</a>         <strong>if</strong> (stream == <strong>null</strong>) {
<a name="103" href="#103">103</a>             <strong>return</strong> <strong>super</strong>.toString() + <span class="string">":LazyStreamNotOpenYet"</span>;
<a name="104" href="#104">104</a>         } <strong>else</strong> {
<a name="105" href="#105">105</a>             <strong>return</strong> getStream().toString();
<a name="106" href="#106">106</a>         }
<a name="107" href="#107">107</a>     }
<a name="108" href="#108">108</a> 
<a name="109" href="#109">109</a> }
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